Basic classes for four-manifolds not of simple type

الأصل · EN

We extend the notion of basic classes (for the Donaldson invariants) to 4-manifolds with b+>1 which are (potentially) not of simple type or satisfy b₁ >0. We also give a structure theorem for the Donaldson invariants of 4-manifolds with b+>1, b₁>0 and of strong simple type.